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acaustic
Acaustic vs Ultrasonic - What's the difference?
acaustic
|
ultrasonic
|
Acaustic
is likely misspelled.
Acaustic
has no English definition.
As an adjective
ultrasonic
is
beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.